How to Use Passive Buzzer with Arduino?

/*
Passive_buzzer
http//www.keyestudio.com
*/
#define NOTE_B0  31
#define NOTE_C1  33
#define NOTE_CS1 35
#define NOTE_D1  37
#define NOTE_DS1 39
#define NOTE_E1  41
#define NOTE_F1  44
#define NOTE_FS1 46
#define NOTE_G1  49
#define NOTE_GS1 52
#define NOTE_A1  55
#define NOTE_AS1 58
#define NOTE_B1  62
#define NOTE_C2  65
#define NOTE_CS2 69
#define NOTE_D2  73
#define NOTE_DS2 78
#define NOTE_E2  82
#define NOTE_F2  87
#define NOTE_FS2 93
#define NOTE_G2  98
#define NOTE_GS2 104
#define NOTE_A2  110
#define NOTE_AS2 117
#define NOTE_B2  123
#define NOTE_C3  131
#define NOTE_CS3 139
#define NOTE_D3  147
#define NOTE_DS3 156
#define NOTE_E3  165
#define NOTE_F3  175
#define NOTE_FS3 185
#define NOTE_G3  196
#define NOTE_GS3 208
#define NOTE_A3  220
#define NOTE_AS3 233
#define NOTE_B3  247
#define NOTE_C4  262
#define NOTE_CS4 277
#define NOTE_D4  294
#define NOTE_DS4 311
#define NOTE_E4  330
#define NOTE_F4  349
#define NOTE_FS4 370
#define NOTE_G4  392
#define NOTE_GS4 415
#define NOTE_A4  440
#define NOTE_AS4 466
#define NOTE_B4  494
#define NOTE_C5  523
#define NOTE_CS5 554
#define NOTE_D5  587
#define NOTE_DS5 622
#define NOTE_E5  659
#define NOTE_F5  698
#define NOTE_FS5 740
#define NOTE_G5  784
#define NOTE_GS5 831
#define NOTE_A5  880
#define NOTE_AS5 932
#define NOTE_B5  988
#define NOTE_C6  1047
#define NOTE_CS6 1109
#define NOTE_D6  1175
#define NOTE_DS6 1245
#define NOTE_E6  1319
#define NOTE_F6  1397
#define NOTE_FS6 1480
#define NOTE_G6  1568
#define NOTE_GS6 1661
#define NOTE_A6  1760
#define NOTE_AS6 1865
#define NOTE_B6  1976
#define NOTE_C7  2093
#define NOTE_CS7 2217
#define NOTE_D7  2349
#define NOTE_DS7 2489
#define NOTE_E7  2637
#define NOTE_F7  2794
#define NOTE_FS7 2960
#define NOTE_G7  3136
#define NOTE_GS7 3322
#define NOTE_A7  3520
#define NOTE_AS7 3729
#define NOTE_B7  3951
#define NOTE_C8  4186
#define NOTE_CS8 4435
#define NOTE_D8  4699
#define NOTE_DS8 4978
#define REST 0
int tempo=114; // change this to make the song slower or faster
int buzzer = 8;// initializes  digital I/O PIN to control the buzzer
// notes of the moledy followed by the duration
// a 4 means a quarter note, 8 an eighteenth , 16 sixteenth, so on
//  !!negative numbers are used to represent dotted notes
//  so -4 means a dotted quarter note, that is, a quarter plus an eighteenth
int melody[] = {
  NOTE_E4,4,  NOTE_E4,4,  NOTE_F4,4,  NOTE_G4,4,//1
  NOTE_G4,4,  NOTE_F4,4,  NOTE_E4,4,  NOTE_D4,4,
  NOTE_C4,4,  NOTE_C4,4,  NOTE_D4,4,  NOTE_E4,4,
  NOTE_E4,-4, NOTE_D4,8,  NOTE_D4,2,
  NOTE_E4,4,  NOTE_E4,4,  NOTE_F4,4,  NOTE_G4,4,//4
  NOTE_G4,4,  NOTE_F4,4,  NOTE_E4,4,  NOTE_D4,4,
  NOTE_C4,4,  NOTE_C4,4,  NOTE_D4,4,  NOTE_E4,4,
  NOTE_D4,-4,  NOTE_C4,8,  NOTE_C4,2,
  NOTE_D4,4,  NOTE_D4,4,  NOTE_E4,4,  NOTE_C4,4,//8
  NOTE_D4,4,  NOTE_E4,8,  NOTE_F4,8,  NOTE_E4,4, NOTE_C4,4,
  NOTE_D4,4,  NOTE_E4,8,  NOTE_F4,8,  NOTE_E4,4, NOTE_D4,4,
  NOTE_C4,4,  NOTE_D4,4,  NOTE_G3,2,
  NOTE_E4,4,  NOTE_E4,4,  NOTE_F4,4,  NOTE_G4,4,//12
  NOTE_G4,4,  NOTE_F4,4,  NOTE_E4,4,  NOTE_D4,4,
  NOTE_C4,4,  NOTE_C4,4,  NOTE_D4,4,  NOTE_E4,4,
  NOTE_D4,-4,  NOTE_C4,8,  NOTE_C4,2
};
// sizeof gives the number of bytes, each int value is composed of two bytes (16 bits)
// there are two values per note (pitch and duration), so for each note there are four bytes
int notes=sizeof(melody)/sizeof(melody[0])/2; 
// this calculates the duration of a whole note in ms (60s/tempo)*4 beats
int wholenote = (60000 * 4) / tempo;
int divider = 0, noteDuration = 0;
void setup() {
  // iterate over the notes of the melody
  // remember, the array is twice the number of notes (notes + durations)
  for (int thisNote = 0; thisNote < notes * 2; thisNote = thisNote + 2) {
    // calculates the duration of each note
    divider = melody[thisNote + 1];
    if (divider > 0) {
    noteDuration = (wholenote) / divider; // regular note, just proceed
    } else if (divider < 0) {
      // dotted notes are represented with negative durations!!
      noteDuration = (wholenote) / abs(divider);
      noteDuration *= 1.5; // increases the duration in half for dotted notes
    }
    // we only play the note for 90% of the duration, leaving 10% as a pause
    tone(buzzer, melody[thisNote], noteDuration*0.9);
  // Wait for the specief duration before playing the next note
    delay(noteDuration);
    noTone(buzzer);  //  stop the waveform generation before the next note
  }
}
void loop() {
// if you want to repeat the song forever, 
// just paste the setup code here instead.
}